Is Kerberos a particular product or a standard? If it is a standard, is it widely supported? If it is supported, what major products have it integrated into their solutions?

Strictly speaking, Kerberos is a "proposed standard." It's RFC 1510. You can read the RFC (request for comment) and related standards
here. Once at the site, enter "Kerberos" in the search window to see all related documents.

A large number of operating systems can use this standard. Most notably, it is the default authentication system used in Windows 2000 and Windows Server 2003 domains. Clients in these domains that run either OS or Windows XP Professional use it by default for network authentication. Kerberos can be implemented in a wide range of other operating systems, including many Unix systems. Residents of the United States and Canada can obtain a copy of Kerberos from MIT (Massachusetts Institute of Technology). Many other sources, both open-source and commercial exist (Click here for a couple of them).

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